<template>
    <h2>当前求和为：{{sum}}</h2>
    <button @click="sum++">点我+1</button>
    <hr>
    <h2>当前的信息为：{{msg}}</h2>
    <button @click="msg+='!'">修改信息</button>
    <hr>
    <h2>姓名：{{person.name}}</h2>
    <h2>年龄：{{person.age}}</h2>
    <h2>薪资：{{person.job.j1.salary}}K</h2>
    <button @click="person.name += '~'">修改姓名</button>
    <button @click="person.age++">增长年龄</button>
    <button @click="person.job.j1.salary++">涨薪</button>    
</template>

<script>
import {ref,reactive,watch,watchEffect} from 'vue'

export default {
  name: 'Demo',
  setup(props,context){
    // 数据
    let sum = ref(0)
    let msg = ref('你好啊')
    let person = reactive({
        name:'张三',
        age:18,
        job:{
            j1:{
                salary:20
            }
        }
    })

    // watch(sum,(newValue,oldValue)=>{
    //     console.log('sum值变化了',newValue,oldValue)
    // },{immediate:true})

    watchEffect(()=>{
        const x1 = sum.value
        const x2 = person.job.j1.salary
        console.log('watchEffect所指定的回调执行了')
    })


    return{
      sum,
      msg,
      person
    }

  }
}
</script>

